Concrete-steel sidewalk.



PATENTED JUNE 23, 1903.

W. MUESER. CUNCRBTE-STEEL SIDEWALK.

APPLICATION FILED APR. 23, 1903.

2 SHEETS-SHEET 1.

N0 MODEL.

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No. 731,595. PATENTED JUNE 2a, 1903.

W. MESBR.

I CONCRETE-STEEL SIDEWALK.

APPLICATION FILED APR.23,1903.

N0 MODEL. 2 SHEETS-SHEET 2.

Ji-"Ji atented .T une 23, 1903.

`PATENT GFFICE.

`WILLIAM MUESER, OF NEW YORK, N. Y.

CONCRETE-STEEL SIDEWALK.

` SPECIFICATION forming part of Letters Patent No. 731,595, dated June23, 1903.

Application led April 23, 1903.

To a/ZZ whom t may concern.-

`Steel Sidewalks, of which the following is a specification. y

. My invention relates to sidewalks for bridges and viaducts; and itsnovelty consists in the construction and adaption of the parts, as willbe more fully hereinafter pointed out.

In the drawings, Figure 1'A is a side elevation of a bridge composed oftwo spans and provided with my improved invention. Fig. 2 is averticalsection of the same on the plane of the line 22 in Fig. 1. Fig.3 is a similar view on the plane of the line 3 3 in Fig. l. Fig. 4 is atop plan view of the sidewalk, a part of the upper layer of concretebeing broken away. Fig. 5 is an enlarged walk connections.

side elevation andpartial vertical longitudi` nal section of a part ofthe sidewalk. Figs. 6, 7, and 8 are'detailed vertical sections of thelower portions of the parapet and its side- My invention relates to whatis known as y concrete-steel construction-that is, it can 1n concretetoform an integral part and pracries out'the principle of incorporatingsteel tically homogeneous structure, the steel reinforcing the concrete;y r f Sidewalks on the upper longitudinal sides of bridges and viaduetsare now frequently made of concrete or cement. The present practice isto build such sidewalk structures i into place after the bridge orviaduct proper has been nearly completed and is supported for its wholewidth by the bridge or viaduct. The purpose of my invention is toconstruct a concrete-steel sidewalk whichwill be supported on its centerand will overhang the spandrel-walls, one which will be "light,

strong, and stable, weigh less and cost'less, and be more economicallyerected than the present devices known to me,`and which by reason of itsoverhang will save very materially in the cost and weight of the bridgeor viaduct itself, as the bridge can be narrower to the extent of theamount of overhang, which means a corresponding reduction in Serial No.153,934. (No model.)

the arch-masonry, piers, and abutment-ma- .i

sonry, and earth or other filling lover 4the arches, piers, andabntments, and also a decreased amount of excavation and size offoundations on account of the reduction in width ofthe bridge or viaductand thesmaller weight to be carried.

In the drawings, 10 is a bridge composed of two spans. 11 l1 are thearches. l2 is the central pier.` 13 13 are the wing-walls concealing theabutments. spandrel-walls. 15 is the roadway, and 16 the earth till. Allof these parts are of usual construction and need no especial ordetailed description to one skilled in the art.

2O is my concrete-steel sidewalk, composed of an upper layer of concrete21 and' a lower layer of concrete 22. Embedded in the concrete aretransverse steel bars 23, placed at suitable intervals and molded inplace in the course of the construction of the sidewalk. The sidewalk ispreferably made in slabs or sections 24 of any convenient or suitablesize, and these may be made at the place of erection of the bridge orelsewhere and transported to the place of such erection. The lower layerof concrete 22 is thicker at its middle portion than elsewhere and isadapted to rest upon the upper surface of the spandrel wall 14. It maybe and preferably should be provided with an offset 22, adapted toengage with a similar offset l4in the spandrel-wall, so as to preventany outwardly lateral shifting. Where the strain on the sidewalk is aptto be greater than would be taken care of by these offsets, there arearranged at suitable intervals anchor-bars 30, cast into the lowerconcrete layer 22 of the sidewalk and the upper part of thespandrelwall. These are shown in the right-hand sidewalks in Figs. 2 and3.

As an additional precaution against rotation or displacement of thesidewalk under an excessive load, Il prefer to extend the bars 23inwardly and turn them down at 23a to form a curb 40. This curb extendslongitudinally along the outer edges of the roadway and is partlyembedded in a` portion of the earth fill 16a. This curb being a part ofthe sidewalk requires considerable less material than the curbs now inuse along the outer edges of the roadway and which must be.

14 14 are the IOO iirmly set and embedded deep enough in the earth iill16a to insure their independent stability. However, the curb may be madeof stone or concrete, as at 40a in Fig. 2, in the usual manner.v In suchcase the inner edge of the sidewalk should merely abut against thiscurb.

In order to strengthen the slabs or sections 24 in theirlongitudinal-union, I make each slab with a projection 24 and acorresponding indentation 24C on its opposite edfre to aiord mea-ns ofinterlocking the slabs. Metal dowel-s or other forms of dovetailingwould be an equivalent of this construction and may be used, if deemeddesirable.

I provide the sidewalk on its outer edge with a parapet or hand-rail,which' may be of anyusual construction; but I prefer a parapet of apeculiar form which is especially adapted for use with this form ofsidewalk. This parapet consists of vertically-placed monolithic slabs 5l5l 5l and each having a base memberl 52 and a top member 5.3 and eachprovided with one or more laterally-extending buttresses 5l at suitableintervals. The parapet may be set along the edge of the sidewalk andjoined to it with mortar or cement in the usual manner; but whereadditional strength and security are required I prefer to anchor it tothe concrete body of the sidewalk by rods 55, bolts 56, or some similarequivalent construction, as shown in Figs. 6 and 7. To strengthen andrender easier the construction of the slabs 5l, I prefer to make them attimes with an incased layer of woven-wire fabric 57, as shown in sectionin Fig. 8.

The advantages of my invention are considerable. The sidewalk beingbalanced, it exerts only a Vertical pressure upon the spandrel-wall andrequires no other form of support by brackets or the like.A It effects asaving in the width of the entire structure, and therefore a seriouseconomy in its construction. It may be built as the bridge is built ormade in slabs elsewhere and then and there erected as the bridgeprogresses, saving all false work or staging. It uses the usual materialfor the sidewalk, but saves the filling under the usual sidewalk andleaves a space, as 70,- for the receipt of pipes, electrical con--ductors, and the like.

What I claim as new is- 1. In abridgeort-'iaductcomprisingaspandrel-wall, a concrete-steel sidewalk made inslabs and centrally supported along the top of the spandrel-wall.

2. In a bridge or viaduct comprising a spandrel-wall, a concrete-steelsidewalk, centrally supported along the top of a spandrel-wall.

3. In a bridge or viaduct, comprising a spandrel-wall, a concrete-steelsidewalk centrally supported along the top of the spandrel-wall andengaging therewith through oisets on the lower part of the sidewalk andthe upper part of the wall.

4:. In a bridge or viaduct, comprising aspandrel-wall, a concrete-steelsidewalk centrally supported along, the top of the spandrel-wall andengaging therewith through offsets on the lower part of the sidewalk andthe upper part of the wall, and anchored thereto by bars or boltsembedded in both.

5. In a bridge or viaduct, comprisingaspandrei-wall, a concrete-steelsidewalk centrally supported along the top ot' the spandrel-wall andanchored thereto by means of bars or bolts embedded in a sidewalk andthe wall.

6. Inabridgeor viaduct, comprisingaspandrei-wall and a roadway, aconcreteysteel sidewalk centrally supported along the top of thespandrel-wall and provided with a downwardly-turned inner ange to form acurb.

7. In a bridge or viaduct, comprisinga spandrel-wall and a roadway aconcrete sidewalk provided with embedded transverse metallic bars andcentrally supported along the top of the spandrel-wall.

8. In abridge or viaduct, comprisinga spandrei-wall and a roadway, aconcrete sidewalk provided with embedded transverse metallic bars andcentrally supported along the top of the spandrel-wall, the bars andtheir surrounding concrete envelop being turned down at the inner edgeof the sidewalk to form a curb.

9. In a bridge or viaduct, comprising a spandrel-wall and a roadway,aconcrete-steel sidewalk made in slabs and centrally supported along theltop of the spandrel-wall and provided with transverse metallic barseach slab being provided with means forinterlocking with the slabadjacent to it.

lO. In a bridge or viaduct, comprising a spandrel-wall, a concrete-steelsidewalk made in slabs and centrally supported along the top of thespandrel-wall, each slab being provided with means for interlocking withthe slab adjacent to it and with the spandrelwall.

11. In a bridge or viaduct, comprising a spandrel-wall anda roadway, aconcrete-steel sidewalk made in slabs and centrally supported along thetop of the spandrel-wall, each slab being provided with means foriuterlocking with the slab .adjacent to it and with the spandrel-wall,and provided with an inner ange, to form a curb.

l2. In a bridge or viaduct comprising a spandrel-wall, a concrete-steelsidewalk centrally supported along the top of the spandrelwall andprovided with an upwardly-extended parapet.

13. In a bridge or viaduct, comprising a spandrel-wall, a concrete-steelsidewalk centrally supported along the top of the spandrel-wall andprovided with an upwardly-extended parapet consisting ot' slabs ofconcrete united to the upper surface of the sidewalk in any suitablemanner.

14. In a bridge or viaduct, comprising a spandrelwvall, a concrete-steelsidewalk centrally supported along the top of the spandrel-wall andprovided with an upwardly-ex- IIO tending parapet consisting of slabs ofconcrete with 4means 4uniting them to the upper surface of the sidewalkand provided at snitable intervals with buttresses.

15. In a bridge or viaduct, comprising a `spandrel-wall, aconcrete-steel sidewalk centrally supported along the top of thespandrel-wall and provided with an upwardlyextended parapet consistingof slabs of concrete in which are embedded sheets of wovenwire fabricsand provided at suitable intervals with buttresses.

16. In a bridge or viaduct, comprising a

